Re: [CAD_CAM_EDM_DRO] Spindle power VS Motor power

Jon,

Ok. I see your points. But it still doesn't answer the question. The reason
I ask this question is
that there is a friend of mine who has a big CNC milling with a dead
controller. The spindle is 20 kW.
So, If I put like 200 watts motor for each axis. Would the spindle be
considered too much?

I suspect there are general rules that would give me estimate that the
spindle should be A times of motor
axis.

Thanks for the info at the web. I really appreciate it.

fortino

----- Original Message -----
From: "Jon Elson" <elson@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, May 22, 2003 12:22 AM
Subject: Re: [CAD_CAM_EDM_DRO] Spindle power VS Motor power


>
>
> fortino wrote:
>
> >Hi groups,
> >
> >Supposed, I design 3 axis CNC Milling for about 100 watts for each axis.
> >What is the suitable Spindle motor power to match the axis motor power? I
> >can't have under power or over power spindle, can I.
> >
> >
> It is not so simple. Watts is power - which translates to force x
> speed. So, a 100 Watt
> motor can deliver 1 million Lbs (Newtons, if you prefer) force at a tiny
> velocity, or
> just one Lb force at a million times faster rate. You need to analyze
> the materials and
> the type of cutters you will be working with, and make an estimate of
> the linear force
> applied to the workpiece by the cutter. Then, decide what feedrate will
> be needed, and
> then you can calculate the axis and spindle power required. Note that
> for drilling, there
> is minimal axis load, but the spindle load can be very high. For best
> surface finish,
> proper feedrates and speeds are needed, so the larger drills require a
> fair bit of
> horsepower for this work.
>
> See my page on this at http://www.timgoldstein.com/cad_cam/motor.htm
>
> Jon
>
>
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